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Features

Boring Machine

Paddle Shafts for Pacific Mail Steamers

Are the Planets Inhabited?

The New York State Reward for Improvements in Canal Navigation

The Metropolitan Museum of Art

Burning Water as Fuel

Army and Navy Patents

The Employment of Women

Arsenic Colors

The System of Snow Protection on the Union Pacific Railroad

The Boston Fire Commissioners' Report

Free Mail Privileges Ended

Mixing Cylinder for Concrete

The Pantagraph

The Chemical Discoveries by the Spectroscope

The Lost Arts

Lynn's Anti-Freezing Railroad Tank Valve and Feeder

Steam Filter and Condenser

Pneumatic Gun Carriage and Elevator

Decisions of the Courts

United States Circuit Court—Southern District of New York.

Recent American and Foreign Patents

Patent Office Decisions

Answers to Correspondents

Communications Received

Departments

  • Departments

    Correspondence

  • Notes and Queries

  • Business and Personal

  • Index of Inventions

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February 15, 1873

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